KVM: MMU: Make flooding detection work when guest page faults are bypassed
When we allow guest page faults to reach the guests directly, we lose
the fault tracking which allows us to detect demand paging. So we provide
an alternate mechnism by clearing the accessed bit when we set a pte, and
checking it later to see if the guest actually used it.
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 7de948e..08ffc82 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -346,6 +346,7 @@
gfn_t last_pt_write_gfn;
int last_pt_write_count;
+ u64 *last_pte_updated;
struct kvm_guest_debug guest_debug;